Mold for centrifugal casting



Patented Sept. 8, 1925.

PATENT OFFICE.

men GAMMEN, or NEW YORK, a. Y.

HOLD FOB CENTRIFUGAL CASTING.

Application fled larch 18, 1925. Serial m5. 15,278.

To all whom it may comm.-

I Be it known that I, LEON CAMMEN, a citizen of the United States, and resident of the borough of Manhattan in the city,

county, and State of New ork, have invented certain useful Improvements in Molds for Oentrifu 1 Casting, of which the following is a speci cation.

' The present invention deals particularly with molds for centrifugally casting ingots sheet bars, and the like, as dist-inguishe from the more common process of centrifu gally casting tubes, and specifically describes means toensure convenient removal of the castings from the mold.

The illustration shows a section of. the mold at right angle to the axis of rotation.

When a tube is centrifugally cast, it n'at-' urally stays in the mold until pulled out, and the problem is how to remove it therefrom rather than how to keep it in its place in the mold. But in casting ingots, sheet and plate bars, and the like, when there are more than two pieces, special attention must be devoted to means to keep the ieces in place at a time when they are not eld either by gravity or by centrifugal force, as e. g., when the mold slows up in spinning or stops altogether.

. It is obvious that, unless special provision is made, when the mold stops spinning, the pece 1 at the top of mold 2 will fall to the ttom, and the same will probably happen to several other pieces, such as 3 and 4, and possibly 5 and 6. The pieces will then ile up which will make their rapid removal fficult, and in falling may injure the mold, and themselves become bent.

It is to prevent this that the present invention has been devised. Another purpose is to ensure that the cast piece may be pulled out of the mold in a convenient manner and yet without dra gin it over the surface of the mold, as t is atter might result in scratching the surface 11 Still another ggrpose is to ensure that t e cast pieces will located, when the mold stops spinning, in such positions that they could be convenient- I pulled out of the mold b pro r ma- 50 chinery, such as jaw grabs.

necess that the cast pieces be away from the mol .far enough to permit the jaws of ortisitis the grab to far. I

In the present invention, the partition lugs 8, have their faces 90' so arranged that the casting 1, when the mold is in the position shown in the illustration, is free to move downwards, and away from the mold. To permit this, the face 90 of the partition lug 8 is cut at an obtuse angle with the tangent 19 to the inside face of the mold 2 passing through the origin of 90. This feature in itself is not new, as molds for centrifugal casting of ingots and the like have been so built in the past.

With this arrangement alone, however, the casting would be free to fall to the bottom of the mold, which, as has been shown above, is undesirable. To prevent this, the partition lugs 8 are e uipped with shoulders 11 which limit the distance through which the casting can move away from the face of the mold, and also tend to keep the casting in the proper position so that it might be convenient y held by the jaws of the ab.

The particular shape of the shoul ers 11 and their construction is amatter that any engineer skilled in the art may decide for himself. The shoulders may be in one piece with the lugs, and made by machining or forging, or they may be welded or riveted on to the lugs. Instead of making a continuous shoulder, pins may be driven into the lug, or the lug edge may be upset here and there to form the shoulder abutment. The problem is simply to rovide means to keep! the casting from f ling away from the face of the mold to a greater extentthan it is desired, and vmodern machine shop practice afi'ords several means to achieve this endwithin the confines of this invention.

a As centrifugal casting of objects other than tubes is, commercially, a new art, its terminology is still vague, and the parts 8 which have been referred to above as partition lugs, are also called projections, shapes, dividing bars, etc.

I claim:

1. A mold for centrifugal casting havin partitionlugs whereinthe said lugs are of such a shape that the casting, when not held to the wall of the mold by centrifugal force get hold of them, and yet not too or gravity, is free to move away therefrom,

-. and wherein the said lugs are provided with means to limit said freedom of motion of the casting away from the wall of the mold 6 to the desired extent.

' 2. A mold for centrifugal casting having partition lugs wherein said lugs are provided with shoulders to keep from falling out castings which are not held by' centrifugal force or aviQ Signed in ew ork, in the county and State of New York, February 16, 1925.

LEON CAMMEN. 

